SU1594647A1 - Multiple-pole permanent magnet - Google Patents

Abstract

The invention relates to electrical engineering, namely the production of permanent magnets, and can be used in the manufacture of multi-pole inductors of electrical machines. The purpose of the invention is to simplify the magnetic characteristics and increase the utilization rate of the magnet material. Multi-pole magnet is made of N pole and N interpolar portions (N≥4 is the number of magnet poles) from an anisatropic magnetically hard material. The pole sections have the shape of sectors in cross section, the axes of their easy magnetization are parallel to the axes of the corresponding poles, the interpolar regions have the shape of isosceles triangles, the axes of their easy magnetization are perpendicular to the corresponding geometric neutrals. With increasing number of poles, the total magnetic flux to all poles does not decrease, and the hole for the non-magnetic shaft is enlarged. This contributes to an increase in the magnetic flux, the arrival of mass per unit mass, and a decrease in the rotor inertia moment, since the rotor shaft can be made of a light non-magnetic material. 2 Il.

Description

The invention relates to electrical engineering, namely the production of permanent magnets, and can be used in the manufacture of multipolar rotors of electrical machines.

The purpose of the invention is to improve the magnetic characteristics and increase the coefficient of use of the magnet material,

Figure 1 shows a section perpendicular to the axis of a multi-pole magnet (p 8); Fig. 2 shows the lines of force of the magnetization vector in a state magnetized to saturation of all sections of the magnet along the axes of easy magnetization.

A multi-pole (in particular, eight-pole) magnet consists of n pole sections 1 of anisotropic magnetic-hard material with a crystalline and magnetic texture parallel to the axes of the respective poles, bounded in cross section by a pole arc value of 2 l: / n and two segments of chords 2 drawn from the ends of the pole arc so that they intersect on the axis of this pole and are limited

arc equal and n prismatic

3 sections of additional anisotropic permanent magnets, having a cross-sectional shape of isosceles triangles, with a crystalline and magnetic texture parallel to the base of these three triangles, and placed between the pole sections, parts 1 and 3 are mounted on a nonmagnetic sleeve 4,

ate yu

s

Os

4iw vj

A multi-pole permanent magnet is manufactured and operates as follows.

Prismatic sections of these two types are cut out of a hard magnetic latermal having a unidirectional crystalline and magnetic texture. Further, these areas of coefficients, for example, are glued together, in accordance with Fig. 1. Thereafter, the multi-pole magnet is magnetized either in the device in which it will operate, or in a conventional inductor used for magnetization. If the magnet is magnetized in the inductor, then after magnetization it moves with preservation of the magnetic circuit in the device where it will work. Further, the inside of the magnet can be filled with a non-magnetic material (the magnet is smeared on a non-magnetic sleeve 4 or shaft).

The introduction of prismatic sections 3 of anisotropic magnetically hard material between the pole sections 1 makes it possible to achieve that in the state of all the sections of the magnet magnetized to saturation along the axes of easy magnetization the magnetic field of the magnet is due to magnetic charges distributed on the surface of the poles, having an arc 2l; / n, i.e. more than in a known solution. the magnet has no magnetic charges, since the magnetization vector does not undergo a jump of the normal component at the boundary between sections 1 and 3, because the magnetization vector of the pole section and the magnetization vector of section 3 constitute

same angle equal to - + Yn

zannoy border (figure 1). Therefore, a decrease in the magnetic flux due to internal magnetic charges does not occur.

Due to this, the proposed multi-pole magnet, in comparison with the known, consisting of prismatic sections adjacent in the central part to the magnet sleeve, has a large

the magnitude of the magnetic flux to the pole due to the high magnetic characteristics of individual areas with a straight crystalline and magnetic texture and their

a form that eliminates the appearance of parasitic magnetic charges at the boundaries of the sections; reduces the consumption of anisotropic magnetically hard material and eliminates the need for a magnet to use a soft material to close the pole sections; obtained close to the magnetic field topography required for magnetization (it coincides with the topography of the magnetization vector in a saturated state of 5); the space in the vicinity of the magnet axis can be used to place rods with a current to obtain an optimal topography of the magnetic field during the magnetization process.

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Claims (1)

Claims of the invention A multi-pole permanent magnet, mainly for inductors of electrical machines with a number of poles equal to n, 5, made in the form of a cylinder from parts of an anisotropic hard magnetic material, characterized in that, in order to improve the magnetic characteristics and increase the utilization of the magnet material, parts of the magnet are made in the form of p-pole sections, bounded in cross-section by a 2l pole arc; / n and two segments of chords bounded by an arc  -L- and passing through the ends specified5 2 n pole arcs, between the pole sections are additional magnets in the form of isosceles triangles in cross section, the sides of which lie adjacent to the indicated chords, and the apex of the angle between them is located between the ends of the pole arcs, the axes of easy magnetization of the pole sections are along the axis of the poles, and the axis of the lung magnetizing 45 additional magnets are parallel to the base of the triangles, parts of the magnet are mounted on a non-magnetic sleeve. (f) Ut1